Padlock



May 4, 1937. B. SCHLESINGER El AL ,079,578

PADLOCK Filed Sept. 7,- 1934 INVENTORS a; z p Bgauu. 971' I I g. K

" ATTORNEY.

Patented May 4, 1937 I mm STATES PADLOCK Benjamin Schlesinger, Flushing, and Oscar M. Martin, Albany, N. Y., assignors to Railroad Accessories Corporation, New York, N. Y., a corporation of New York Application September '7, 1934, Serial No. 743,028

4 Claims. (Cl.- 70-38) This invention relates to looks, particularlyto locks known as padlocks, and more especially to that form of padlock which is secured in locked position by a threaded bolt. I

Those acquainted with railway track structures are aware that the ordinary form of padlock, operable by the ordinary form 'of key, is rather unsuitable for most of the stations where a padlock is required along a right-of-w'ay' ofa railway. This is so, because there is so much dirt and dust flying about, and the padlocks are so exposed to rain, snow, and sleet that the ordinary 'form of padlock, including a rather narrow orifice for the insertion of a key, is unsuitable." The key slot, or the interior of the padlock soon becomes filled with dust and dirt, or ice in winter, so that it is quite impossible to properly manipulate the key.

Heretofore padlocks of a very simple construction have been used along the rights-of way of railways to secure such apparatus as is necessary to protect from tampering by unauthorized persons, but a great difliculty with the simple form, which is in general construction about as is shown in the drawing of this application, is that the U shape or hook part thereof became separated from the base and consequently often became lost.

A principal object of the present invention is to provide a construction adaptable to the padlocks of the simple construction commonly used along the right-of-way of a railway such that the base and hook of the padlock will not become -separated.

Other objects and advantages will appear as the description of the particular physical embodiment selected to illustrate the invention progresses, and the novel features will be particularly pointed out in the appended claims.

In describing the invention in detail reference will be had to the accompanying drawing and the several views thereon, in which, similar characters of reference designate similar parts throughout the several views and in which:

Figure 1 is a front elevational view of a padlock embodying applicants invention with some parts broken away to more clearly show the construction; Fig. 2 is a top plan view of the device as shown by Fig. 1; Fig. 3 is a bottom plan View of the device as shown by Fig. 1; Fig. 4 is a crosssectional view of the device as shown by Fig. 1, on the plane indicated by the line IVIV of Fig. I, viewed in the direction of the arrows at the ends of the line; Fig. 5 is an enlarged fragmentary view of the looking or stop means of applicants invention; Fig. 6 is a front elevational view of a padlock embodying applicants invention with the hook thereof in unlocked position; Fig. '7 is a perspective view of a locking bolt used with applicants invention; Fig. 8 is a perspective view of a slotted collar used in applicants invention.

Numeral I designates the body or base portion of a padlock. This body or base portion is provided with an orifice 2 by which it may be attached, as: by a' chain, to an apparatus which is to be secured by the padlock. The base I is formed with a cavity 3 and a bore 4. The bore 4 is adapted to receive the body or shank of a screw threaded bolt 5, the head 6 of which may bear against the end wall I of the cavity 3, or preferably against a lock washer 8 interposed between the head and the end wall.

The shackle 9 of the padlock is provided with a threaded bore Ifi matching the threads of the bolt 5.

Heretofore padlocks have been made simulating that hereinbefore described. Such padlocks in use were locked'and unlocked by means of a key or socket wrench applied to the head 6 of the bolt.5. If the shackle 9 were put in place as shown 'in Fig. l and then the bolt 5 entered through the bore 4 into the bore I and tightened up, the two parts I and 9 would be secured together and the locking function would be performed. The difiic'ulty with such construction, however, is that the bolt may be entirely removed from the shackle 9 so that the parts I and 9 may be entirely separated, and one may become lost.

1 .In applicants construction means are provided toiprevent the bolt 5 from being separated from the shackle 9. This means includes a stop tail II formed, preferably, integrally with the bolt 5. This tail I I is of reduced diameter for the greater part of its length but at the extreme end thereof is provided with a stop head I2 larger than the remaining portion of the tail.

A locking collar I3 is also provided. This locking collar surrounds the reduced portion of the tail II and is preferably formed with a slot l4 so that it may be placed upon the tail I I when the tail II is made integrally with the bolt 5. This locking collar is screw threaded on its periphery, and the screw threads are such that they mate with the screw threads in the bore II).

In use applicants place the locking collar I3 on the reduced portionof the tail I I and then introduce the tail into the bore I0 while the shackle 9 is positioned over the bore 4. By turning the bolt 6 the collar I3 will be threaded into the bore Ill being driven around either by friction, or if that is not sufilcient, by a small burr I5 raised on the end of the bolt 5. When the bolt has been screwed home as shown in Figure 1, the locking collar will have been moved to the position as shown in Fig. 1. When the bolt is again unscrewed, the slightest turn of the bolt will move it away from the locking collar and consequently the locking collar will be left in the position as shown in Fig. 1. By suitably proportioning the parts the locking collar will be left in such position that the bolt may be backed out of the hook 9 suificient to allow the end l6 thereof to be withdrawn from the cavity H, but the bolt can be withdrawn only to such an extent as is allowed by the head 22 thereof, because the head l2 abuts the inner surface of the locking collar l3 after the bolt 5 has been withdrawn from the shackle 9 sufficient to allow ample clearance between the end l6 and the base I.

The construction of applicants padlock is such then that if once assembled the shackle 9 and the base I cannot be separated, so that either of the parts may not become lost so as to render the other part worthless or incapable of serving as a padlock.

Although we have particularly described oneparticular physical embodiment of our invention, and explained the operation, construction and principle thereof, nevertheless, we desire to have it understood that the form selected is merely illustrative, but does not exhaust the possible physical embodiment of the idea of means underlying our invention.

What we claim as new and desire to secure by Letters Patent in the United States is:

1. In a locking device, in combination: a base member formed with a bore connecting with a cavity having an end wall and with a cavity adapted to receive the end of a shackle; a shackle having an end adapted to rest in the second men- 49 tioned cavity of the base, and formed with a threaded bore aligning with the bore in the base when the end of the shackle is in the second mentioned cavity of the base; a screw threaded bolt having a head adapted to engage with the end wall of the first mentioned cavity and to thread into the screw threaded bore of the shackle whereby the shackle and base are held firmly together; a slotted threaded locking collar adapted to be threaded into the screw threaded bore of the shackle; a tail formed on the bolt and passing through the collar, said tail formed with an enlarged head whereby the collar when placed on the tail and threaded into the bore of the shackle will prevent the complete withdrawal of the bolt upon unscrewing the same, whereby the shackle and base cannot become separated.

2. A first body formed with a bore; a second body formed with a screw threaded bore; a screw threaded bolt for passing through the bore of one body into the bore of the other body for securing the two bodies together; means for preventing the complete withdrawal of the bolt from the bore in the said second body after it has once been entered therein including a threaded collar formed with a through orifice, a tail upon the bolt passing through the threaded collar, and a head upon the tail of such size that it cannot pass through the orifice in the threaded collar.

3. As a means for fastening two bodies together, the combination of one body having a bore therethrough; another body having a threaded bore therein;.a threaded bolt for passing through the bore in one body into the threaded bore of the other body, said threaded bolt being formed with a tail with an enlarged head and a stem of smaller diameter; and a locking collar formed with an orifice through which the stem extends and formed on its periphery with a screw thread matching the screw thread of the screw threaded bore whereby when the bolt and collar are first entered into the screw threaded bore, the collar is advanced to a definite position and upon the backing out of the bolt the screw threaded collar is left in its then position to contact with the head of the tail to prevent the separation of the bolt from the body.

4. As a means for fastening two bodies together, the combination of one body having a bore therethrough; another body having a threaded bore therein; a threaded bolt for passing through the bore in one body into the threaded bore of the other body, said threaded bolt being formed with a tail with an enlarged head and a stem of smaller diameter and a projection on the bolt at the juncture of the bolt and the tail-.vpositioned for engagement with a locking collar; and a locking collar formed with an orifice through which the stem extends and formed on its periphery with a screw thread matching the screw thread of the screw threaded bore whereby when the bolt and collar are first entered into the screw threaded bore, the collar is advanced to a definite position and upon the backing out of the bolt the screw threaded collar is left in its then position to contact with the head of the tail to prevent the separation of the bolt from the body;

BENJAMIN SCI-ILESINGER. OSCAR M. MARTIN. 

